How check if cweld is link only with shell?

Hi,

try this procedure:
-isolate CWELD elements of interest with the mask panel (F5)
-in the Find panel (shift+ F5) find elements attached to the CWELD elements. The attached elements will be unmasked. 
-check if the unmasked elements contain 3d elements (use the mask browser to show/hide entities by element types).

Hi.

I tried your procedure but No elements were found. I think that CWELD isn't linked directly by nodes/elements.

<?xml version="1.0" encoding="UTF-8"?>

Looks like the CWELD element is not attached directly to adjacent elements but through the tie contact. 
In Radioss user profile there is the option to include tied contact. Unfortunately, such functionality is not supported in Optistruct user profile.

<?xml version="1.0" encoding="UTF-8"?>